CN103869401A - Polarizing plate, method of preparing the same, and liquid crystal display apparatus including the same - Google Patents
Polarizing plate, method of preparing the same, and liquid crystal display apparatus including the same Download PDFInfo
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- CN103869401A CN103869401A CN201310693574.7A CN201310693574A CN103869401A CN 103869401 A CN103869401 A CN 103869401A CN 201310693574 A CN201310693574 A CN 201310693574A CN 103869401 A CN103869401 A CN 103869401A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
Abstract
A polarizing plate, a method of preparing the same and a liquid crystal display apparatus including the same are disclosed. The polarizing plate includes a polarizer and a polyester film formed on a surface of the polarizer, wherein the polyester film has a ratio of an elongation ratio in a machine direction to an elongation ratio in a transverse direction of about 1:0.8 to about 1:1.2, an in-plane retardation (Re) of about 500 nm or less at a wavelength of 550 nm, and an out-of-plane retardation (Rth) of about 10,000 nm or less at a wavelength of 550 nm.
Description
Technical field
The present invention relates to polarization plates and preparation method thereof and comprise its liquid crystal display.
Background technology
Polarization plates is used for the object of the orientation of oscillation of controlling light, to manifest the display pattern of the inside and outside liquid crystal display of liquid crystal cells.Although liquid crystal display is applied to midget plant at its initial stage of development, but liquid crystal display is used to widely, in range of application, to comprise surveying instrument that notebook computer, LCD monitor, color liquid crystal projector, LCD TV, vehicle mounted navigational system, portable phone, indoor and outdoor are used etc. in recent years.Particularly, LCD monitor and LCD TV are used the back light unit of high brightness conventionally.Therefore the polarizing coating, using in polarization plates also needs to demonstrate the performance higher than conventional products.Polarization plates comprises polarizer and diaphragm, and described diaphragm is formed on a surface of polarizer and protects polarizer.Conventionally,, although diaphragm is tri acetyl cellulose (TAC) film, TAC film is more expensive than typical polymer film.Therefore, use the cheap polymer film that comprises polyethylene terephthalate (PET) film to replace TAC film, but because the super drawing meeting of carrying out for the improvement of productive rate makes it have high phase differential.And, comprise that the liquid crystal display of PET film can produce the rainbow spot (rainbow spots) of positive and side, causes deterioration in image quality.
Summary of the invention
According to an aspect of the present invention, polarization plates can comprise: polarizer, with the polyester film being formed on the upper surface of described polarizer, wherein said polyester film has the ratio (length growth rate on MD direction: length growth rate on TD direction) of about 1:0.8 to the length growth rate in MD direction of about 1:1.2 and the length growth rate in TD direction, in the approximately 500nm under the wavelength of 550nm being represented by equation 1 or less plane, postpone (Re), with represented by equation 2 under the wavelength of 550nm approximately 10,000nm or less plane external delays (Rth).
< equation 1>
Re=(nx-ny)×d
< equation 2>
Rth=((nx+ny)/2-nz)×d
Wherein nx, ny, nz and d are middle definition following detailed description.
According to another aspect of the present invention, the method of preparing polarization plates can comprise: by the ratio (length growth rate in MD direction: the length growth rate in TD direction) to the length growth rate in MD direction of about 1:1.2 and the length growth rate in TD direction with about 1:0.8, the vibrin melt extruding that simultaneously stretches in MD and TD direction is prepared polyester film; With described polyester film is attached on the upper surface of polarizer.
According to a further aspect of the invention, liquid crystal display can comprise polarization plates.
Accompanying drawing explanation
Below providing by reference to the accompanying drawings, the detailed description of embodiment, above and other aspects, features and advantages of the present invention will become obviously, wherein:
Fig. 1 is according to the sectional view of the polarization plates of an embodiment of the invention;
Fig. 2 is the exploded perspective illustration of polarization plates according to another implementation of the invention; With
Fig. 3 is according to the sectional view of the module for liquid crystal display of an embodiment of the invention.
Embodiment
Explain with reference to the accompanying drawings embodiments of the present invention.Should be understood that the present invention can realize in a different manner, and be not limited to embodiment below.In accompanying drawing, for clear, the part irrelevant with described explanation will be omitted.In whole instructions, identical Reference numeral will represent identical element.As used in literary composition, with reference to accompanying drawing definition term for example " above " and " below ".Therefore, should understand term " above " can and term " below " exchange ground use.Because " side " as used herein can have in up/down/left/right direction 0 ° to being less than 90 ° and/or be greater than the visual angle of 90 ° to 180 °.Term " length growth rate " refers to the length and the ratio between the initial length of polyester film after in the time that polyester film stretches on its length direction polyester film stretches as used herein, or in the time that polyester film stretches on its Width the width after polyester film stretching and the ratio between the original width of polyester film.As used herein, in order to represent shaft distortion, "+" can refer to the clockwise direction with respect to axis of reference, and "-" can refer to the counter clockwise direction with respect to axis of reference, the absorption axes that wherein said axis of reference is polarizer.
Hereinafter, describe in detail according to the polarization plates of an embodiment of the invention with reference to Fig. 1.Fig. 1 is according to the sectional view of the polarization plates of an embodiment of the invention.
With reference to Fig. 1, can comprise according to the polarization plates 100 of an embodiment of the invention: polarizer 110, be formed on the polyester film 120 on the upper surface of polarizer 110, and the blooming 130 forming on the lower surface of polarizer 110.
In one embodiment, the length growth rate in MD direction that polyester film can have is extremely extremely extremely extremely extremely extremely extremely extremely extremely extremely about 1:1.08 or extremely about 1:1.07 of about 1:0.85 of about 1:1.09, about 1:0.85 of about 1:1, about 1:0.85 of about 1:1.01, about 1:0.99 of about 1:1.02, about 1:0.99 of about 1:1.03, about 1:0.98 of about 1:1.04, about 1:0.97 of about 1:1.05, about 1:0.96 of about 1:1.1, about 1:0.95 of about 1:1.15, about 1:0.9 of about 1:0.85 with the ratio of the length growth rate in TD direction.
In one embodiment, the length growth rate in MD direction that polyester film can have is approximately 1.0 to approximately 4.0, for example approximately 2.5 to approximately 3.5, for example approximately 2.5,2.6,2.7,2.8,2.9,3.0,3.1,3.2,3.3,3.4 or 3.5, and the length growth rate in TD direction is approximately 1.0 to approximately 4.0, for example approximately 2.5 to approximately 3.5, for example approximately 2.5,2.6,2.7,2.8,2.9,3.0,3.1,3.2,3.3,3.4 or 3.5.Within this scope, because the length growth rate in MD direction is substantially the same with the length growth rate in TD direction, so in the time wherein using polyester film, polarization plates can not produce positive and side rainbow spot.
Because polyester film 120 has low phase differential by stretch simultaneously, and there is substantially the same length growth rate at MD with TD direction, produce positive and side rainbow spot so polyester film 120 can prevent polarization plates simultaneously.In one embodiment, polyester film 120 can have in the approximately 500nm under the wavelength of 550nm that represented by equation 1 or less plane and postpones (Re), with represented by equation 2 under the wavelength of 550nm approximately 10,000nm or less plane external delays (Rth):.
< equation 1>
Re=(nx-ny)×d
< equation 2>
Rth=((nx+ny)/2-nz)×d
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm, the thickness (unit: nm) that d is described film.
Within the scope of these of Re and Rth, polarization plates can't produce positive and side rainbow spot, and in the time that polarization plates is applied to display panels, can make display panels demonstrate excellent optical property.Preferably, under the wavelength of 550nm, the Re that polyester film has is that about 0nm is to about 500nm, more preferably about 0nm is to about 400nm, most preferably be about 0nm to about 200nm, for example approximately 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490 or 500nm.Herein, in the time that Re approaches 0, polyester film has better quality.Under the wavelength of 550nm, the Rth that polyester film has is about 0nm to approximately 10,000nm, be preferably about 0nm to approximately 4,000nm or approximately 3,000nm is to approximately 10,000nm, for example approximately 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000, 5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900, 7000, 7100, 7200, 7300, 7400, 7500, 7600, 7700, 7800, 7900, 8000, 8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 8900, 9000, 9100, 9200, 9300, 9400, 9500, 9600, 9700, 9800, or 9900nm.
Under the wavelength of 550nm, it is approximately 1 or larger that polyester film 120 has the degree of biaxiality (NZ) being represented by equation 3, is preferably approximately 15 to ∞ (for example, 15 to 10
10000), more preferably approximately 50 to ∞ (not restrictions) (for example, 50 to 10
10000), for example infinite.
< equation 3>
NZ=(nx-nz)/(nx-ny)
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described polyester film under the wavelength of 550nm.
Within this scope, polyester film makes liquid crystal display demonstrate desirable picture quality, and can not produce rainbow spot.In polyester film, x-direction of principal axis, y-direction of principal axis and z-direction of principal axis correspond respectively to MD direction, TD direction and the thickness direction of polyester film.
Under the wavelength of 550nm, the nx ≒ ny(nx ≈ ny that polyester film 120 has, nx approximates greatly ny) and nx-ny be approximately 0 to approximately 0.1, be preferably approximately 0 to approximately 0.01, for example approximately 0.001,0.002,0.003,0.004,0.005,0.006,0.007,0.008,0.009 or 0.01.Herein, in the time that nx-ny approaches approximately 0, polyester film has better quality.Therefore, polyester film can have the NZ of ∞.Within the scope of this, comprising can be because the subtle change of phase differential (depending on angle and the wavelength of incident light) produces positive and side rainbow spot as the polarization plates of the polyester film of diaphragm.
Because polyester film 120 right and wrong are birefringent, there is no birefringence, comprising can be because the subtle change of phase differential (depending on angle and the wavelength of incident light) produces positive and side rainbow spot as the polarization plates of the polyester film of diaphragm.
The mist degree (haze) that polyester film 120 can have for being less than approximately 2%, for example, is less than approximately 1%, and for example approximately 0.1% to approximately 1.9% or approximately 0.1% to approximately 0.9%.Although for to be less than approximately 2% low haze, can prevent that according to polyester film of the present invention polarization plates is because its low phase differential produces rainbow spot.
Although not do not show in Fig. 1, polyester film 120 can further be included on its upper surface to give functional functional coat, for example hard conating, anti-reflecting layer or anti-fingerprint layer.Functional coat can have the thickness of 1 μ m to 100 μ m.Within the scope of this, in the time that polyester film is stacked on polarizer, polyester film can be applicable to polarization plates.
In addition, although be presented in Fig. 1, polyester film 120 can further be included in the surface coating on its lower surface.Polyester film has hydrophobic surface.Particularly, in the time that polyethylene terephthalate film is used as diaphragm, diaphragm demonstrates higher hydrophobicity.For such film is applied to polarization plates, this film is carried out to surface modification, so that its surface is changed into hydrophilic surface from hydrophobic surface.When by the surface modification (it is for existing cellulose membrane) that uses NaOH during for the protection of the surface modification of film, the surface of diaphragm may be not enough to modification or may be damaged.For the surface coating that solves such problem, comprise the priming paint with hydrophobic functional groups and hydrophilic functional group can be formed on diaphragm.The priming paint with hydrophobic functional groups and hydrophilic functional group can comprise vibrin, vinylite or its potpourri, but is not limited to this.By adding surface coating that the engineering properties of diaphragm and low water vapor permeability are maximized, thereby give the height endurability of polarization plates to severe external condition.In addition, can between diaphragm and polarization plates, form surface coating, to improve the adhesiveness between diaphragm and polarizer.
Because polarizer 110 has the molecule of arranging with specific direction, therefore, in the time that polarizer is arranged in liquid crystal display, the light of polarizer transmission specific direction.Polarizer can, by polyvinyl alcohol film being dyeed with iodine or dichroic dye, then stretch and prepare in a certain direction.Especially, prepare polarizer by swelling, dyeing, stretching and crosslinked technique.Every kind of technique all can be undertaken by the general known method of those skilled in the art.
Polarizer 110 can have the thickness of approximately 10 μ m to approximately 30 μ m.Within the scope of this, polarizer can be applicable to the polarization plates for liquid crystal display.
Blooming 130 is bonded to display panels via bonding agent, and it can be phase shift films, and has phase differential and the compensation visual angle of preset range.In one embodiment, under the wavelength of 550nm, in plane that blooming has, phase differential (Re) is for about 30nm is to about 60nm, and for example approximately 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59 or 60nm.Within the scope of this, the blooming compensation birefringence that liquid crystal cells produces in the time that light passes liquid crystal cells, therefore provides the effect of widening visual angle and white and black compensation.
Blooming 130 is transparent blooming, and can be the non-polyester film of polyester film or eliminating polyester.Especially, blooming can form by being selected from least one following resin: cellulose comprises tri acetyl cellulose etc., and polyester comprises polyethylene terephthalate, polybutylene terephthalate, PEN, PBN etc.; cyclic polyolefin, polycarbonate, polyethersulfone; polysulfones; polyamide, polyimide, polyolefin; polyacrylate; polyvinyl alcohol (PVA), Polyvinylchloride, and polyvinylidene chloride.
Blooming 130 can have for approximately 10 μ m are to the thickness of approximately 500 μ m.Within the scope of this, blooming can be applicable to the polarization plates for liquid crystal display.
Although do not show in Fig. 1, polarization plates can comprise the binding layer between polarizer 110 and polyester film 120 and between polarizer 110 and blooming 130, to improve physical strength.Binding layer can comprise typical bonding agent, for example, in water base bonding agent, pressure-sensitive bonding agent and photocurable bonding agent at least one.
In addition, although do not show in Fig. 1, blooming 130 can be stacked in display panels (not shown) by adhesive phase.Adhesive phase can be formed by the bonding agent that demonstrates (bonding agent for blooming are needed) such as the transparency, permanance, re-workabilities, for example, comprises the bonding agent as (methyl) acrylic copolymer of adhesive resin.
Hereinafter, describe polarization plates according to another implementation of the invention in detail with reference to Fig. 2.Fig. 2 is the decomposition diagram of polarization plates according to another implementation of the invention.
With reference to Fig. 2, polarization plates 200 according to another implementation of the invention can comprise: polarizer 110; Be formed on the polyester film 120 on the upper surface of polarizer 110; With the blooming 130 being formed on the lower surface of polarizer 110, wherein blooming 130 can have be more than or equal to approximately+0.03 ° and be less than the angle [alpha] of the shaft distortion (axis distortion) of fast axle (fast axis) 130a of approximately+0.2 ° with respect to the absorption axes 110a of polarizer 110.Polarization plates 200 is with basic identical according to the polarization plates of above-mentioned embodiment, except blooming has be more than or equal to approximately+0.03 ° and be less than the angle of shaft distortion of the fast axle of approximately+0.2 ° with respect to the absorption axes of polarizer, polarization plates 200 and be identical substantially according to the polarization plates of above-mentioned embodiment.Therefore, will be described in more detail below shaft distortion.
With reference to Fig. 2, blooming 130 can have be more than or equal to approximately+0.03 ° and be less than the angle of the shaft distortion (P-r) of the fast axle of approximately+0.2 ° with respect to the absorption axes of polarizer 110.When having, blooming is more than or equal to approximately+0.03 ° and while being less than the angle of shaft distortion (P-r) of the fast axle of approximately+0.2 °, polarization plates can demonstrate good polarization efficiency, whereby in the time that this polarization plates is arranged in liquid crystal display, liquid crystal display can demonstrate good contrast.Especially, the angle of the shaft distortion of its fast axle of the absorption axes with respect to polarizer that blooming can have is approximately+0.03 ° to approximately+0.15 °, more particularly be approximately+0.04 ° to approximately+0.15 °, for example+0.03 ° ,+0.04 ° ,+0.05 ° ,+0.06 ° ,+0.07 ° ,+0.08 ° ,+0.09 ° ,+0.10 ° ,+0.11 ° ,+0.12 ° ,+0.13 ° ,+0.14 ° or+0.15 °.Conventionally, in the time that optical film stack is stacked on polarizer, for maximum polarization efficiency needs must not have shaft distortion therebetween.In addition, in the time that polarization plates has maximum polarization efficiency, in the time that polarization plates is arranged in liquid crystal display, liquid crystal display can demonstrate maximum contrast.According to the present invention, by controlling such shaft distortion, display panels can demonstrate front and/or side polarization efficiency and the contrast of improvement.
Secondly, in detail the method for preparing polarization plates according to an embodiment of the invention will be described.According to an embodiment of the invention, the method of preparing polarization plates can comprise: the ratio as about 1:0.8 to about 1:1.2 by the length growth rate take in MD direction and the length growth rate in TD direction, and the vibrin melt extruding that simultaneously stretches in MD and TD direction is prepared polyester film; With polyester film is attached on the upper surface of polarizer.
If although polyester film is prepared by sequence stretching in MD direction and TD direction, or vice versa, length growth rate in MD direction and the ratio of the length growth rate in TD direction be about 1:0.8 to about 1:1.2, but the polarization plates that comprises polyester film is because restive refractive index and phase differential can produce rainbow spot.In addition, even if polyester film is by the preparation that stretches in MD and TD direction simultaneously, if the length growth rate of MD direction with the ratio of the length growth rate in TD direction not in above-mentioned scope, comprise that the polarization plates of polyester film can produce rainbow spot, thereby make the deterioration in image quality of liquid crystal display.Polyester film can have approximately 1 to approximately 4 length growth rate in MD direction, and in TD direction, has approximately 1 to approximately 4 length growth rate.
Because described polyester film is by stretching and can easily control refractive index and phase differential aspect in MD and TD direction, so comprise that the polarization plates of this polyester film can not produce rainbow spot.
Based on the Tg of vibrin, can be at the temperature of approximately (Tg-20) ℃ to approximately (Tg+50) ℃, use at least one in stretching of dry type stretching and wet type to stretch.For example, stretching can be carried out at following temperature: approximately 70 ℃ to approximately 150 ℃, and preferably approximately 80 ℃ to approximately 130 ℃, more preferably from about 90 ℃ to approximately 120 ℃, for example approximately 90,100,110 or 120 ℃.Stretching can be carried out any number of times to determined number, and as long as polyester film has length growth rate as above and can carry out multi-drawing.
Polarizer can, by with iodine or dichroic dye, polyvinyl alcohol film being dyeed, then stretch and prepare in certain direction.Conventionally be all well known by persons skilled in the art for the preparation of every kind of technique of polarizer.
Polyester film can use usual way to be bonded on polarizer, can comprise at least one of water base bonding agent, pressure-sensitive bonding agent and photocurable bonding agent for the bonding agent of this method.
According to this embodiment, described method can further comprise and blooming is attached to below polarizer upper, and can comprise at least one of water base bonding agent, pressure-sensitive bonding agent and photocurable bonding agent for the bonding agent in conjunction with blooming.Especially, suppose in the time that blooming is bonded to polarizer, polarizer be placed on blooming above, as shown in Figure 2, this blooming can be bonded to polarizer, to have the angle with respect to the shaft distortion that is equal to or greater than the fast axle of approximately+0.03 ° and be less than+0.2 ° of the absorption axes of polarizer.
According to an embodiment of the invention, liquid crystal display can comprise the module for liquid crystal display, and described liquid crystal display comprises the polarization plates according to embodiment of the present invention.Then, describe in detail and be used for according to the module for liquid crystal display of an embodiment of the invention with reference to Fig. 3.Fig. 3 is for according to the sectional view of the module for liquid crystal display of an embodiment of the invention.
With reference to Fig. 3, can comprise according to the module 300 for liquid crystal display of an embodiment: display panels 205; Be formed on the first polarization plates 220 on the upper surface of display panels 205; And be formed on the lower surface of display panels 205 and be placed in the second polarization plates 230 between display panels 205 and light source 240, wherein the first polarization plates 220 can comprise the first blooming 222 on the upper surface that is formed on display panels 205, be formed on the first polarizer 224 on the upper surface of the first blooming 222, and be formed on the first polyester film 226 on the upper surface of the first polarizer 224; The second polarization plates 230 can comprise the second blooming 232 on the lower surface that is formed on display panels 205, is formed on the second polarizer 234 on the lower surface of the second blooming 232, and is formed on the second polyester film 236 on the lower surface of the second polarizer 234; And first at least one in polarization plates 220 and the second polarization plates 230 can be the polarization plates according to an embodiment of the invention.
First substrate and second substrate can be identical or different, and can be glass substrate or plastic base.Plastic base can comprise polyethylene terephthalate (PET) substrate, polycarbonate (PC) substrate, polyimide (PI) substrate, PEN (PEN) substrate, polyethersulfone (PES) substrate, polyacrylate (PAR) substrate and cyclic olefine copolymer (COC) substrate, these substrates can be applicable to flexible display, but are not limited to this.
Liquid crystal cell layer can comprise that vertical orientated (VA) pattern, coplanar conversion (IPS) pattern, fringing field switch the crystal of (FFS) pattern and twisted-nematic (TN) pattern.
Hereinafter, the present invention describes in more detail with reference to some embodiment.But, should be noted that these embodiment are only provided as example, and should not be interpreted as limiting by any way the present invention.
The detailed content of the parts that use in embodiment and comparative example is as follows:
(1) polarizer: polyvinyl alcohol film (VF-PS6000, Japanese Kuraray company limited, thickness: 60 μ m)
(2) polyester film: polyethylene terephthalate film (COSMOSHINE TA015, Toyobo company limited, thickness: 100 μ m, mist degree: be less than 1%)
(3) blooming: tri acetyl cellulose film (KC4DR-1, Japanese Fuji company limited, thickness: 40 μ m)
Embodiment 1 to 4
By to the processing of dyeing for the material of polarizer, then stretch to wait and prepare polarizer.Especially, at 60 ℃, after polyvinyl alcohol film being stretched to 3 times of length of its initial length, iodine is adsorbed on polyvinyl alcohol film, in the BAS of 40 ℃, is stretched to afterwards 2.5 times of length of the film length after above-mentioned stretching, thereby makes polarizer.According to the condition providing in table 1, at 100 ℃ simultaneously after dry type stretching polyethylene terephthalate film, use bonding agent by polyethylene terephthalate membrane stack on the upper surface of polarizer, then use bonding agent that optical film stack is stacked on the lower surface of polarizer, thereby make polarization plates.
Comparative example 1 to 4
Prepare polarization plates with the method identical with embodiment 1, difference is the stretching condition as changed polyethylene terephthalate film in table 1.
Comparative example 5
Prepare polarization plates with the method identical with embodiment 1, difference is that the angle of shaft distortion is 0 °.
The following character of the polarization plates of preparing in Evaluation operation example and comparative example.Result is presented in table 2.
Table 1
* the angle of shaft distortion: in the time that blooming is attached to the lower surface of polarizer, the fast axle of blooming is with respect to the angle of the shaft distortion of the absorption axes of polarizer.
Table 2
(1) postpone: in the plane of use Axo Scan (Axometrics company limited) measurement polyethylene terephthalate film under the wavelength of 550nm, postpone (Re) and plane external delays (Rth), and calculate by equation 1 and 2 described above.
(2) rainbow spot: polarization plates is assembled on the display panels that comprises VA mode liquid crystal.Assembling polarization plates, makes blooming be set to upper surface and the lower surface of Fluid Contacting LCD panel.Use spectroradiometer (SR-3A, Topcon company limited), observe front (directions at 90 ° of visual angles) and its side (directions at 45 ° or 135 ° visual angles) upper rainbow spot that forms at panel.To be evaluated as respectively X, △, O and ◎ without rainbow spot, a small amount of rainbow spot, medium rainbow spot and serious rainbow spot evaluation.
(3) angle of shaft distortion and polarization efficiency: use Axoscan to measure the angle of shaft distortion between the absorption axes of polarizer and the fast axle of blooming, and use Jasco V7100 to measure polarization efficiency.Especially, in MD direction, carry out the sampling of polarization plates, the sample of (long × wide) size that there is 50mm × 50mm to provide.Make after light incides the surface of blooming first, to use Jasco V7100 to measure polarization efficiency, and use Axoscan to measure the shaft distortion between the absorption axes of polarizer and the fast axle of blooming setting sample.The sample of the comparative example 5 based on without any shaft distortion calculates the difference of polarization efficiency.
(4) contrast: the polarization plates of preparation is attached to 32-inch liquid crystal panel (LTA320AP02, company limited of Samsung), then uses nitometer SR-3A (Topcon company limited) to measure contrast.The value of contrast (CR) for measuring in the time that polarization plates is arranged on liquid crystal panel, CRO is the calculated value of the contrast of the sample based on comparative example 5, and (CR of the sample of comparative example 5) is than the percentage of (CR-CR of the measurement of the sample of comparative example 5).
As shown in table 1, the polarization plates of preparing in embodiments of the invention can not produce positive and side rainbow spot.Therefore, embodiments of the invention provide the polarization plates comprising as the polyethylene terephthalate film of the stretching of diaphragm, and in the time that this polarization plates is arranged on display panels, can not produce positive and side rainbow spot.In addition, embodiments of the invention provide polarization plates, and it is out of shape the display panels contrast that demonstrates high polarization efficiency and improvement by Control Shaft.
On the contrary, in comparative example 1 to 2, although wherein the length growth rate in MD direction meets according to scope of the present invention with the length growth rate in TD direction, but polyester film stretches in not carrying out in MD and TD direction, and polarization plates can not prevent the problem of the rainbow spot causing due to the unevenness of length growth rate.In addition, in comparative example 3 to 4, although wherein stretch in MD and TD direction simultaneously, the length growth rate in MD direction that polyester film has has exceeded according to scope of the present invention with the ratio of the length growth rate in TD direction, and polarization plates can not prevent the problem of the rainbow spot causing due to birefringence.
It will be understood by those skilled in the art that the embodiment that can make various modifications, variation, change and equivalence under spirit and scope of the invention not deviating from.
Claims (18)
1. a polarization plates, comprising:
Polarizer; With
The polyester film forming on the upper surface of described polarizer,
Wherein said polyester film have 1:0.8 to the length growth rate in MD direction of 1:1.2 the ratio with the length growth rate in TD direction, in the 500nm under the wavelength of 550nm being represented by equation 1 or less plane, postpone Re, with represented by equation 2 under the wavelength of 550nm 10,000nm or less plane external delays Rth:
< equation 1>
Re=(nx-ny)×d
< equation 2>
Rth=((nx+ny)/2-nz)×d
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm, the thickness that d is described film, unit: nm.
2. according to the polarization plates of claim 1, wherein said polyester film has the ratio of the length growth rate in MD direction of 1:1 and the length growth rate in TD direction.
3. according to the polarization plates of claim 1, wherein said polyester film has 1 or the larger degree of biaxiality NZ that are represented by equation 3:
< equation 3>
NZ=(nx-nz)/(nx-ny)
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm.
4. according to the polarization plates of claim 1, wherein, in the time that nx and ny are respectively the refractive index on x-and y-direction of principal axis, the nx-ny that described polyester film has is 0 to 0.1, and has 15 to ∞ the degree of biaxiality NZ being represented by equation 3:
< equation 3>
NZ=(nx-nz)/(nx-ny)
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm.
5. according to the polarization plates of claim 1, wherein said polyester film right and wrong are birefringent.
6. according to the polarization plates of claim 1, wherein said polyester film is formed by least one in pet resin, polybutylene terephthalate resin, PEN resin and PBN resin.
7. according to the polarization plates of claim 1, further comprise: the blooming on the lower surface of polarizer.
8. according to the polarization plates of claim 7, wherein said blooming is phase shift films.
9. according to the polarization plates of claim 7, wherein said blooming is formed by least one of celluosic resin, vibrin, cyclic polyolefin resin, polycarbonate resin, polyethersulfone resin, polysulfone resin, polyamide, polyimide resin, polyolefin resin, polyacrylate resin, polyvinyl alcohol resin, Corvic and polyvinylidene chloride resin.
10. according to the polarization plates of claim 7, wherein said blooming has with respect to being more than or equal to of the absorption axes of described polarizer+0.03 ° and be less than+the shaft distortion angle of the fast axle of 0.2 °.
Prepare the method for polarization plates, comprising for 11. 1 kinds:
Arrive the ratio of 1:1.2 by the length growth rate take in MD direction and length growth rate in TD direction as 1:0.8, the vibrin melt extruding that simultaneously stretches in MD and TD direction is prepared polyester film; With
Described polyester film is attached on the upper surface of polarizer.
12. according to the method for claim 11, wherein said polyester film has in the 500nm under the wavelength of 550nm that represented by equation 1 or less plane and postpones Re, with represented by equation 2 under the wavelength of 550nm 10,000nm or less plane external delays Rth:
< equation 1>
Re=(nx-ny)×d
< equation 2>
Rth=((nx+ny)/2-nz)×d
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm, the thickness that d is described film, unit: nm.
13. according to the method for claim 11, and wherein said polyester film has 15 to ∞ the degree of biaxiality NZ being represented by equation 3:
< equation 3>
NZ=(nx-nz)/(nx-ny)
Wherein nx, ny and nz are respectively the refractive index x-, y-and z-direction of principal axis on of described film under the wavelength of 550nm.
14. according to the method for claim 11, and wherein said vibrin comprises at least one in polyethylene terephthalate, polybutylene terephthalate, PEN and PBN.
15. according to the method for claim 11, and wherein said polyester film has the ratio of the length growth rate in MD direction of 1:1 and the length growth rate in TD direction.
16. according to the method for claim 11, further comprises: blooming is attached on the lower surface of described polarizer.
17. according to the method for claim 16, wherein described blooming is attached to described polarizer, having with respect to being more than or equal to of the absorption axes of polarizer+0.03 ° and to be less than+and the shaft distortion angle of the fast axle of 0.2 °.
18. 1 kinds of liquid crystal display, comprise according to the polarization plates described in any one in claim 1 to 10 or by the polarization plates of preparing according to claim 11 to the method described in any one in 17.
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| KR1020120147859A KR101631350B1 (en) | 2012-12-17 | 2012-12-17 | Polarizing plate and liquid crystal display apparatus comprising the same |
| KR10-2012-0147859 | 2012-12-17 | ||
| KR10-2013-0061564 | 2013-05-30 | ||
| KR1020130061564A KR101768253B1 (en) | 2013-05-30 | 2013-05-30 | Polarizing plate, method for preparing the same and liquid crystal display apparatus comprising the same |
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| US (1) | US9358768B2 (en) |
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Also Published As
| Publication number | Publication date |
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| US9358768B2 (en) | 2016-06-07 |
| US20140168767A1 (en) | 2014-06-19 |
| TW201432324A (en) | 2014-08-16 |
| CN103869401B (en) | 2016-08-17 |
| TWI530717B (en) | 2016-04-21 |
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